Epidemiology of pneumoconiosis in coalminers of Nord-Pas-de-Calais in France

Abstract : This was a longitudinal study of 3167 active or retired pneumoconiotic coalminers from Nord-Pas de Calais collieries (HBNPC, acronym in French) recognized through medico-legal decisions over three delined periods: 1942-1961, 1962-1981 and 1982-1987. Periodic medical examinations of pneumoconiotics are provided by the medical services of HBNPC for miners and exminers. Physicians involved in this follow-up programme are concerned with the high incidence of progressive massive fibrosis (PMF). The objectives of this study were to describe pneumoconiosis at time of compensation and examine factors related to the occurrence of PMF. For each subject, two radiological films were extracted from the medical files. They were reinterpreted according to the ILO classification (ILO, 1980) by three independent medical readers. Results indicated that radiological criteria for compensation had changed over time ; a marked predominice of category 212 small opacities was noted for cases compensated before 1962 and a predominice of category 1/1 among those compensated after 1981. Comparison of distribution of small opacity types in the 1942-1961 period with that in 1982-1987 confirmed the progressive fall, reported by other investigators, of proportions of predominant micronodular opacities accompanied by an increase in proportions of small irregular opacities at compensation [COCKCROFT and ANDERSON, Br. J. ind. Med. 44,484-487 (1987)]. When time interval between films was taken into account, profusion of small opacities at compensation greater than 1/1 was associated with a probability of 40% or more of developing PMF. Severity of coalworkers simple pneumoconiosis (CWSP) at compensation in HBNPC has been seen to decline since 1982 and the disease to occur mostly after retirement. The reported changes in small opacity types suggest a reduction in incidence of pure silicosis. Occurrence of PMF was correlated with profusion of small opacities at compensation.
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  • HAL Id : ineris-00962558, version 1
  • INERIS : PU-1991-036b

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D. Gautrin, Guy Auburtin, F. Alluin, F.M. Brice, B. Chouraki, et al.. Epidemiology of pneumoconiosis in coalminers of Nord-Pas-de-Calais in France. Annals of Occupational Hygiene, Oxford University Press (OUP), 1994, 38 (suppl. 1), pp.805-809. ⟨ineris-00962558⟩

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